This baby monitor can be used in a Wi-Fi environment. By connecting to your home Wi-Fi and launching the app, you can observe your child's condition on your smartphone. You can change the camera's direction with your smartphone, so you can still see your child even if they roll over and move. It also displays the room temperature, so you can check the condition of the bedroom without opening the door. You can also hear audio, so I used it when my child was small, but I no longer need it, so I am selling it. If the baby monitor is connected to Wi-Fi at home, you can also see your child's condition on your smartphone when you are away from home, so you can rest assured by checking on your child while you have family members looking after them ☺︎ Includes the main unit, AC adapter, and instruction manual.